// 实现这个项目的构建任务
const del = require('del');
const browserSync = require('browser-sync');
const {src,dest, parallel, series,watch} = require('gulp');

// const sass = require('gulp-sass')(require('sass'));
// const babel = require('gulp-babel');
// const swig = require('gulp-swig');
// const imagemin = require('gulp-imagemin');
const loadPlugins = require('gulp-load-plugins');
const plugins = loadPlugins();
const bs = browserSync.create();
const data = {
  menus: [
    {
      name: 'Home',
      icon: 'aperture',
      link: 'index.html'
    },
    {
      name: 'Features',
      link: 'features.html'
    },
    {
      name: 'About',
      link: 'about.html'
    },
    {
      name: 'Contact',
      link: '#',
      children: [
        {
          name: 'Twitter',
          link: 'https://twitter.com/w_zce'
        },
        {
          name: 'About',
          link: 'https://weibo.com/zceme'
        },
        {
          name: 'divider'
        },
        {
          name: 'About',
          link: 'https://github.com/zce'
        }
      ]
    }
  ],
  pkg: require('./package.json'),
  date: new Date()
}
const clean = () =>{
    return del(['dist','temp'])
}
const style = () =>{
    return src('src/assets/styles/*.scss',{base:'src'})
    .pipe(plugins.sass({outputStyle:'expanded'}))
    .pipe(dest('temp'))
    .pipe(bs.reload({stream:true}))
}
const script = () =>{
    return src('src/assets/scripts/*.js',{base:'src'})
    .pipe(plugins.babel({presets:['@babel/preset-env']}))
    .pipe(dest('temp'))
    .pipe(bs.reload({stream:true}))
}
const page = () =>{
    return src('src/**/*.html',{base:'src'})
    .pipe(plugins.swig({data}))
    .pipe(dest('temp'))
    .pipe(bs.reload({stream:true}))
}
const image = () =>{
    return src('src/assets/images/**',{base:'src'})
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}
const font = () =>{
    return src('src/assets/fonts/**',{base:'src'})
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}
const extra = () =>{
    return src('public/**',{base:'public'})
    .pipe(dest('dist'))
}
const serve = ()=>{
    watch('src/assets/styles/*.scss',style)
    watch('src/assets/scripts/*.js',script)
    watch('src/*.html',page)
    // watch('src/assets/images/**',image)
    // watch('src/assets/fonts/**',font)
    // watch('public/**',extra)
    watch([
      'src/assets/images/**',
      'src/assets/fonts/**',
      'public/**'
    ],bs.reload)
    bs.init({
        notify:false,
        port:2080,
        // files:'dist/**', //使用bs.reload stream推送更新
        server:{
            baseDir:['temp','src','public'],
            routes:{
                '/node_modules':'node_modules'
            }
        }
    })
}
const useref = () =>{
  return src('temp/*.html',{base:'temp'})
  .pipe(plugins.useref({'searchPath':['temp','.']}))
  .pipe(plugins.if(/\.js$/,plugins.uglify()))
  .pipe(plugins.if(/\.css$/,plugins.cleanCss()))
  .pipe(plugins.if(/\.html$/,plugins.htmlmin(
    {
      collapseWhitespace: true,
      minifyCSS: true,
      minifyJS: true
    }
  )))
  .pipe(dest('dist'))
}
const compile = parallel(style,script,page);
const build = series(clean,parallel(series(compile,useref),image,font,extra));
const develop = series(compile,serve)
module.exports={
    clean,
    serve,
    compile,
    build,
    develop
}